McDonald's is being sued for allegedly stealing the wages of fast-food workers in Michigan.

The lawsuits allege workers at 21 McDonald's restaurants in Detroit are forced to pay for their own uniforms and work off the clock.

“These unlawful practices have flourished in part because most of the workers are so financially vulnerable that they are afraid to lodge the claims on their own behalf,” says attorney Joe Sellers, who’s handling similar lawsuits in California and New York.